I finally got sick of our power bill about a year ago and started using a kill-o-watt and a few other things to try to track down our usage. We have a lot of stock tank heaters than run for part of the year, and that had masked some things, but it was obvious there was a problem.
We changed two things and that cut our power useage in half across the board.
First, and most relevant, we began using our wood stove to dry clothing in winter, and a line in summer, instead of our electric dryer. That alone halved our power usage in almost all months - 3 farm kids and cloth diapers was really taking a toll on us that I didn't realize.
My wife's blog post about that...
http://mytotalpv.blogspot.com/2013/12/laundry-time.html
Second, and less relevant to most people, was sizing our stock tank heaters appropriately.
I was using 1000 watt heaters - I did some experimenting and found that 500 watt heaters worked just as well. Now I put one of each in the tank and plug in the 1000 watt heaters only if it freezes up (we got to -20 without windchill a few times this year). I'll be building passive solar tanks as well, but in the meantime I have to be sure I can water the animals in that kind of weather.
Thought that would be of interest here. We have done some small things here and there as well, but these were pretty simple to accomplish and have added up a lot already.